/*

 *   SONEWS News Server

 *   see AUTHORS for the list of contributors

 *

 *   This program is free software: you can redistribute it and/or modify

 *   it under the terms of the GNU General Public License as published by

 *   the Free Software Foundation, either version 3 of the License, or

 *   (at your option) any later version.

 *

 *   This program is distributed in the hope that it will be useful,

 *   but WITHOUT ANY WARRANTY; without even the implied warranty of

 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 *   GNU General Public License for more details.

 *

 *   You should have received a copy of the GNU General Public License

 *   along with this program.  If not, see <http://www.gnu.org/licenses/>.

 */

package org.sonews.daemon.command;

import java.io.IOException;

import org.sonews.daemon.NNTPConnection;

import org.sonews.storage.Channel;

import org.sonews.storage.StorageBackendException;

/**

 * Class handling the GROUP command.

 * <pre>

 *  Syntax

 *    GROUP group

 *

 *  Responses

 *    211 number low high group     Group successfully selected

 *    411                           No such newsgroup

 *

 *  Parameters

 *    group     Name of newsgroup

 *    number    Estimated number of articles in the group

 *    low       Reported low water mark

 *    high      Reported high water mark

 * </pre>

 * (from RFC 3977)

 * 

 * @author Christian Lins

 * @author Dennis Schwerdel

 * @since n3tpd/0.1

 */

public class GroupCommand implements Command

{

  @Override

  public String[] getSupportedCommandStrings()

  {

    return new String[]{"GROUP"};

  }

  @Override

  public boolean hasFinished()

  {

    return true;

  }

  @Override

  public String impliedCapability()

  {

    return null;

  }

  @Override

  public boolean isStateful()

  {

    return true;

  }

  @Override

  public void processLine(NNTPConnection conn, final String line, byte[] raw)

    throws IOException, StorageBackendException

  {

    final String[] command = line.split(" ");

    Channel group;

    if(command.length >= 2)

    {

      group = Channel.getByName(command[1]);

      if(group == null || group.isDeleted())

      {

        conn.println("411 no such news group");

      }

      else

      {

        conn.setCurrentGroup(group);

        conn.println("211 " + group.getPostingsCount() + " " + group.getFirstArticleNumber()

          + " " + group.getLastArticleNumber() + " " + group.getName() + " group selected");

      }

    }

    else

    {

      conn.println("500 no group name given");

    }

  }

}